Board-to-Board Connector Hold-Down Structure Against Curling
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Solution Overview
Problem
In board-to-board connectors, the elastic displacement of hold-downs with elastic pieces can be hindered by the housing, and there is a risk of curling deformation of the elastic pieces.
Innovation Solution
A board-to-board connector design featuring a flat-plate housing with a hold-down accommodation recess, a metal hold-down with a reinforcing plate part, solder legs, and an elastic piece supported like a cantilever beam. The elastic piece includes an elastic body, a contact part that projects upward, and a displacement restriction part to prevent excessive upward displacement and curling deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the contact part is made to project upward beyond the housing upper surface, then the contact part can be easily elastically displaced downward, but the contact part may come into contact with the housing and hinder elastic displacement
Solution Approach 1:
A displacement restriction part is introduced as an intermediary element between the contact part and the housing. This displacement restriction part restricts upward displacement of the contact part, preventing the contact part from contacting the housing while allowing downward elastic displacement. The displacement restriction part acts as a mediator that resolves the conflict between needing the contact part to project upward for easy displacement and preventing it from contacting the housing.
2Ease of operation
If the elastic piece is made flexible to allow easy displacement, then the contact part can move freely, but the elastic piece may undergo curling deformation
Solution Approach 1:
The displacement restriction part applies a preliminary counteracting force to prevent curling deformation of the elastic piece. By restricting upward displacement of the contact part, the displacement restriction part prevents the elastic piece from undergoing excessive deformation that would lead to curling. This preliminary anti-action maintains the shape stability of the elastic piece while still allowing necessary elastic displacement for operation.
3Reliability
If the contact part projects upward beyond the housing, then it can make good contact with the board, but it risks contacting the housing and becoming stuck
Solution Approach 1:
The displacement restriction part serves as an intermediary that ensures reliable electrical connection by allowing the contact part to project upward and make good contact with the board, while simultaneously preventing the contact part from contacting the housing. This mediator resolves the conflict between achieving reliable contact and avoiding contact interference.
4Adaptability or versatility
If the elastic piece is allowed to displace freely upward and downward, then it can accommodate board misalignment, but it may undergo curling deformation
Solution Approach 1:
The displacement restriction part applies preliminary anti-action by restricting upward displacement of the contact part, preventing curling deformation while still allowing downward elastic displacement to accommodate board misalignment. This ensures the elastic piece maintains its shape stability while retaining adaptability for mounting variations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design allows for easy elastic displacement of the contact part and prevents curling deformation of the elastic piece, ensuring reliable electrical connections and structural integrity.
Implementation Method 1
a hold-down elastic piece supported like a cantilever beam by the reinforcing plate part, the hold-down elastic piece includes, sequentially from a base to an end of the hold-down elastic piece, an elastic piece body; a contact part projecting upward beyond the housing upper surface; and a displacement restriction part to restrict upward displacement of the contact part
Data Source
AI summary
A high voltage side hold-down includes a flat-plate shaped reinforcing plate part, a solder leg projecting downward from the reinforcing plate part, and a hold-down elastic piece supported like a cantilever beam by the reinforcing plate part. The hold-down elastic piece includes an elastic piece body, a contact part projecting upward beyond a CPU board opposed surface, and a displacement restriction part for restricting upward displacement of the contact part, sequentially from the base to the end of the hold-down elastic piece. A housing is formed in such a way that the contact part does not come into contact with the housing when the contact part is displaced downward and no longer projects upward beyond the CPU board opposed surface.